Editing Powershell Environment Configuration (section)

== Creating and modifying environment variables ==

* [http://technet.microsoft.com/en-us/library/ff730964.aspx Creating and Modifying Environment Variables] (Microsoft TechNet)

=== Display all environment variables ===

<syntaxhighlight lang="powershell">
> Get-ChildItem Env:
</syntaxhighlight>

=== Display information about a particular environment variable ===

<syntaxhighlight lang="powershell">
> $Env:path
</syntaxhighlight>

=== Create a variable for the current session only ===

<syntaxhighlight lang="powershell">
> $env:TestVariable = "This is a test environment variable."
</syntaxhighlight>

=== User- and machine-level environment variables ===

To create a persistent user-level environment variable:

<syntaxhighlight lang="powershell">
> [Environment]::SetEnvironmentVariable("TestVariable", "Test value.", "User")
</syntaxhighlight>

* '''"TestVariable"''' is the name of the variable.
* '''"Test Value."''' is the value assigned to the variable.
* '''"User"''' is the level of the variable. `"User"` makes this a user-level variable. Alternate values are `"Machine"` and `"Process"`.

Variables set with `SetEnvironmentVariable()` don't appear using the `Get-ChildItem env:` command until the current shell is closed and a new one is opened, although the value of the variable can be retrieved with 

<syntaxhighlight lang="powershell">
> [Environment]::GetEnvironmentVariable("TestVariable","User")
</syntaxhighlight>

=== Deleting environment varables ===

<syntaxhighlight lang="powershell">
> Remove-Item Env:\TestVariable
</syntaxhighlight>

Or

<syntaxhighlight lang="powershell">
> [Environment]::SetEnvironmentVariable("TestVariable", $null, "User")
</syntaxhighlight>